Session 3: Flat-Key Territory
Overview
Section titled “Overview”- Phase: 1 — Foundation Expansion
- Duration: 75 minutes
- Prerequisites: Completed Sessions 1-2. Can play D, A, E major scales (2 octaves, hands together at 50-60 BPM). Understands sharp key signatures.
Learning Objectives
Section titled “Learning Objectives”By the end of this session, you will be able to:
- Play Bb major, Eb major, and Ab major scales — 2 octaves, hands together, at 60 BPM
- Read key signatures with multiple flats confidently
- Explain enharmonic equivalents (e.g., Db = C#)
- Perform a simplified arrangement of the “Clair de Lune” theme with both hands
- Describe the different “colour” of flat keys compared to sharp keys
Materials Needed
Section titled “Materials Needed”- Casio CT-X9000IN keyboard (powered on, Grand Piano tone — Tone 000)
- Metronome set to 60 BPM
- Sustain pedal connected (you will use it for the “Clair de Lune” theme)
- This lesson plan open beside you
Warm-Up & Review (10 minutes)
Section titled “Warm-Up & Review (10 minutes)”Scale Review (6 minutes)
Section titled “Scale Review (6 minutes)”Play each scale 2 octaves, hands together, at 60 BPM:
- C major — 1 time (your anchor key)
- D major — 1 time (2 sharps: F#, C#)
- A major — 1 time (3 sharps: F#, C#, G#)
- E major — 1 time (4 sharps: F#, C#, G#, D#)
Listen for evenness. Are all notes the same volume and duration? Is the thumb-under smooth?
Contrary Motion C Major (2 minutes)
Section titled “Contrary Motion C Major (2 minutes)”Both thumbs on Middle C, hands move outward and back, 2 times at 60 BPM.
Quick Chord Review (2 minutes)
Section titled “Quick Chord Review (2 minutes)”Play each as block chord, RH, hold 4 beats: C major — F major — G major — Am — Dm — Em Then play C major in root position, 1st inversion, 2nd inversion. Same with Am.
Theory / Harmony (10 minutes)
Section titled “Theory / Harmony (10 minutes)”Key Signatures: Flats
Section titled “Key Signatures: Flats”Last session you learned the sharp keys. Now you enter the world of flats. If sharps felt “bright,” flats often feel “warm,” “mellow,” or “rich.”
The flat key pattern — the order of flats is always:
Notice this is the reverse of the sharp order (BEADGCF backwards). A useful mnemonic: Battle Ends And Down Goes Charles’ Father.
| Key | Flats | Which Notes Are Flatted |
|---|---|---|
| C major | 0 | None |
| F major | 1 | Bb |
| Bb major | 2 | Bb, Eb |
| Eb major | 3 | Bb, Eb, Ab |
| Ab major | 4 | Bb, Eb, Ab, Db |
You already know F major from the beginner course (1 flat — Bb). Today you add the next three flat keys.
How to quickly find the key from the flats: The second-to-last flat in the key signature IS the key name. For example, Bb major has Bb and Eb — the second-to-last flat is Bb, which is the key. Eb major has Bb, Eb, Ab — the second-to-last flat is Eb. (This trick does not work for F major, which has only one flat — you just memorise that one.)
Enharmonic Equivalents
Section titled “Enharmonic Equivalents”An enharmonic equivalent is when the same key on the keyboard has two different names:
- C# = Db (same black key)
- D# = Eb (same black key)
- F# = Gb (same black key)
- G# = Ab (same black key)
- A# = Bb (same black key)
Play C# and Db. They are the same sound, the same key. The name depends on the musical context — in sharp keys we say C#, in flat keys we say Db.
This will matter when you encounter pieces in different keys. For now, just know that sharp and flat names can refer to the same physical key.
Technique (15 minutes)
Section titled “Technique (15 minutes)”Bb Major Scale — 2 Octaves, Hands Together
Section titled “Bb Major Scale — 2 Octaves, Hands Together”Key of Bb major: 2 flats — Bb and Eb. Every B is flat and every E is flat.
RH — Bb Major, 2 Octaves:
The RH fingering for Bb major starts on finger 4 (because Bb is a black key approached from below):
LH — Bb Major, 2 Octaves:
Important: The fingering is different from sharp keys because the starting note (Bb) is a black key. Your thumb avoids black keys as much as possible — it naturally lands on white keys.
Practice: RH alone 3 times, LH alone 3 times, then very slowly hands together at 40 BPM.
Eb Major Scale — 2 Octaves, Hands Together
Section titled “Eb Major Scale — 2 Octaves, Hands Together”Key of Eb major: 3 flats — Bb, Eb, Ab.
RH — Eb Major, 2 Octaves:
LH — Eb Major, 2 Octaves:
Practice: same process. Hands separate, then together at a very slow tempo.
Ab Major Scale — 2 Octaves, Hands Together
Section titled “Ab Major Scale — 2 Octaves, Hands Together”Key of Ab major: 4 flats — Bb, Eb, Ab, Db.
RH — Ab Major, 2 Octaves:
LH — Ab Major, 2 Octaves:
Practice: same process. Ab major has the most flats of today’s three scales — take extra time with it.
Pattern recognition: Notice that for flat-key scales, the RH often starts on finger 3 (Eb, Ab) or 4 (Bb). This is because the starting note is a black key, and finger 3 or 4 sits naturally on black keys. In sharp-key scales, the RH usually starts on finger 1 because the starting note is a white key.
Repertoire / Genre (25 minutes)
Section titled “Repertoire / Genre (25 minutes)”“Clair de Lune” Theme — Simplified Arrangement
Section titled ““Clair de Lune” Theme — Simplified Arrangement”Claude Debussy’s “Clair de Lune” (Moonlight) is one of the most beautiful piano pieces ever written. The original is in Db major (5 flats) — extremely advanced. This simplified arrangement captures the opening theme in a more accessible key context, giving you a taste of what flat keys can do.
Tempo: 60 BPM (slow and dreamy) | Time Signature: 3/4 | Key: Db major (simplified — we will use the melodic contour with accessible fingering)
This simplified arrangement uses the iconic descending melody from the opening theme, adapted for your current level.
Right Hand:
Left Hand:
Both Hands Together — Practice Strategy:
- LH alone, all 12 measures — The LH plays a repeating broken chord pattern. Learn this first until it is automatic. 4 repetitions at 50 BPM.
- RH alone, measures 1-4 — Slow, dreamy. Let each note sing. 3 repetitions.
- RH alone, measures 5-8 — Note the position shift in measure 7. 3 repetitions.
- RH alone, measures 9-12 — The climax. Measure 10 reaches up to Ab(5). 3 repetitions.
- Both hands, measures 1-4 — Very slowly. The RH melody floats above the LH pattern. 4 repetitions.
- Both hands, measures 5-8 — 4 repetitions.
- Both hands, all 12 measures — play through at 50-60 BPM.
Expression:
- Play the entire piece pp to p (very soft to soft). This is moonlight music — delicate, shimmering.
- Use the sustain pedal: press the pedal at the start of each measure, release and re-press at the start of the next measure. This creates a wash of sound that connects the broken chord in the LH.
- Let the RH melody be slightly louder than the LH — this is called voicing. Play the RH fingers more firmly while keeping the LH light.
Creative / Ear Training (10 minutes)
Section titled “Creative / Ear Training (10 minutes)”Flat Key vs Sharp Key — Hearing the Difference
Section titled “Flat Key vs Sharp Key — Hearing the Difference”Exercise 1: A/B Comparison (4 minutes)
Section titled “Exercise 1: A/B Comparison (4 minutes)”Play these two scales back-to-back, 1 octave, RH only:
- E major (4 sharps) — ascending only
- Ab major (4 flats) — ascending only
Now play them again. Listen carefully.
E major often sounds “bright” and “brilliant.” Ab major often sounds “warm” and “rich.” Some people describe flat keys as having a “darker” or “softer” quality, while sharp keys sound “brighter” or “sharper.”
Now try: 3. D major — ascending 4. Bb major — ascending
Can you hear a similar difference? There is no right answer — you are training your ear to notice subtle tonal colours.
Exercise 2: Key Identification Game (3 minutes)
Section titled “Exercise 2: Key Identification Game (3 minutes)”Close your eyes. Play a scale — pick randomly from C, D, A, E, Bb, Eb, or Ab major. Open your eyes. Were you in a sharp key or a flat key? Could you tell from the sound alone, or only from seeing your fingers?
Over time, your ear will start to associate certain feelings with certain keys. Many composers chose keys deliberately — Beethoven wrote triumphant music in D major and stormy music in C minor.
Exercise 3: Broken Chord Improvisation (3 minutes)
Section titled “Exercise 3: Broken Chord Improvisation (3 minutes)”Using the “Clair de Lune” LH pattern as a starting point, try creating your own broken chord pattern in Ab major:
Play slowly. Let the sounds wash together with the sustain pedal. This is impressionistic playing — it does not need to be “correct,” just beautiful.
Review & Homework (5 minutes)
Section titled “Review & Homework (5 minutes)”Summary
Section titled “Summary”Today you:
- Learned Bb major, Eb major, and Ab major scales — 2 octaves, hands together
- Understood the flat key signature pattern (Bb, Eb, Ab, Db)
- Learned about enharmonic equivalents (C# = Db, etc.)
- Played a simplified “Clair de Lune” theme — your first piece in a flat key
- Explored the different “colours” of flat vs sharp keys
Self-Check Questions
Section titled “Self-Check Questions”- How many flats does each key have? Bb major: ___ Eb major: ___ Ab major: ___
- What is the order of flats? (Hint: reverse of the sharp order)
- What is an enharmonic equivalent? Give two examples.
- Why does the RH fingering for flat-key scales often start on finger 3 or 4 instead of finger 1?
Practice Homework (Before Next Session)
Section titled “Practice Homework (Before Next Session)”- Bb major scale — 10 minutes daily. 2 octaves, hands separate first, then together. Start at 40 BPM, target 60 by end of week.
- Eb major scale — 10 minutes daily. Same process.
- Ab major scale — 5 minutes daily. This has the most flats — take your time. Hands separate is fine for this week.
- D, A, E major review — 5 minutes daily. Keep last week’s sharp keys fresh. Play each once at 60 BPM.
- “Clair de Lune” theme — 10 minutes daily. Focus on smooth LH broken chords with pedal, then add RH melody on top. Target: full piece at 60 BPM with expression.
- Ear training: key colours — 5 minutes. Play 2 sharp scales and 2 flat scales back-to-back. Listen for the difference.
- Total: ~45-50 minutes daily
Common Mistakes to Watch For
Section titled “Common Mistakes to Watch For”- Forgetting the flats: In Eb major, every B, E, and A must be flat. If you accidentally play a natural B or E, the scale will sound wrong immediately. Drill the pattern: which notes are flat?
- Thumb on black keys: Your thumb should avoid black keys whenever possible. If you find your thumb landing on Bb or Eb during a scale, check your fingering — you may be using the wrong starting finger.
- Too much pedal on “Clair de Lune”: The pedal should create a gentle wash, not a muddy blur. Release and re-press at the start of each measure. If the sound becomes unclear, you are holding the pedal too long.
CT-X9000IN Tips
Section titled “CT-X9000IN Tips”Orchestral Tones for “Clair de Lune”
Section titled “Orchestral Tones for “Clair de Lune””Your CT-X9000IN has beautiful tones that can enhance the Debussy feel:
Try these tone settings:
- Strings (Tone 049 — Strings): Play the “Clair de Lune” arrangement with a string tone. The sustained quality matches the dreamy atmosphere.
- Harp (Tone 046 — Harp): The broken chord LH pattern sounds gorgeous on harp — it mimics the arpeggiated quality Debussy loved.
- Grand Piano + Strings (Layer mode): For the most luxurious sound, try layering:
- Press the LAYER button
- Select Grand Piano as your main tone
- Select Strings as your layer tone
- Adjust the layer volume so strings are softer than the piano
This layered sound — piano with a subtle string backing — is the sound of film scores and professional recordings. It turns your CT-X9000IN into a mini-orchestra.
Save this setup to Registration 2 (your “Classical/Romantic” preset) so you can recall it instantly.